Refer to the exhibit:
Apr 5 12:11:25.451: ISAKMP (14): beginning Main Mode exchange
Apr 5 12:11:27.255: ISAKMP (14): processing SA payload, message ID = 0
Apr 5 12:11:27.305: ISAKMP (14): Checking ISAKMP transform 1 against priority 1 policy
Apr 5 12:11:27.305: ISAKMP: encryption DES-CBC
Apr 5 12:11:27.309: ISAKMP: hash MD5
Apr 5 12:11:27.309: ISAKMP: default group 1
Apr 5 12:11:27.309: ISAKMP: auth pre-share
Apr 5 12:11:27.313: ISAKMP (14): atts are acceptable. Next payload is 0
Apr 5 12:11:27.317: Crypto engine 0: generate alg param
Which exchange does this debug output represent?